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K2Cr2O7
+1x2+Cr2+-2x7=0
+2+Cr2+-14=0
Cr2=14-2
Cr2=+6
Cr=+6/2
Cr=+3
b.PO4^3-
karena ion hasil penjumlahannya disesuaikan dengan besar ion
P+-2x4=-3
P=-3+8
P=+5
Cr :+6
O :-2
b. P : +5
O :-2